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The symptom:

  • On MacBookAir, in Safari, FF and Chrrome, when accessing www.google.com, I get redirected to a http://developer.yahoo.com/yql/ web page.
  • On iPhone, when navigating to google.com I get a Yahoo 404 -/ search error
  • On iMac (from which I am posting this message), all seems to work ok

While I am scanning my MacBookAir with an antivirus (Sophos), I wonder, assuming it is infected, how would it also infect my iPhone?

Update As time went by, the issue went away without me having to do anything. Meanwhile i scanned my MBA with Norton, AVG and Sophos - all 3 found no issues.

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Do you sync your iPhone with your MacBook? If so, sync is a likely vector. –  this.josh Dec 3 '12 at 6:14
    
Does your iPhone also redirect, if it's not connected to WIFI? –  Kao Dec 3 '12 at 8:25
    
This sounds more like a DNS issue then malware. The ultimate test is to wipe the iPhone and see what happens. I can nearly guarantee that your iPhone isn't infected with malware. –  Ramhound Dec 3 '12 at 16:17
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2 Answers

Sounds like you may have caught the OSX.RSPlug.A Trojan Look here for instructions on how to remove it: http://www.ehow.com/how_2128387_remove-osxrspluga-trojan-horse-mac.html

This trojan can only be obtained, by you actively downloading and installing it, probably masked as a trustworthy program.

As for antivirus, there's no AV Software out there, that will make sure that you can't obtain a virus. The best advice I can give you, is to use common sense when downloading, and try to verify the source. AV's tends to give people a false sense of security.

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Thank you. I will go over this once i get home. See above, issue 'magically' went away. I went off the home wifi to the library wifi which (i don't have proof of this) may have cleared the issue for the iphone. I don't honestly remember if issue persisted while i was in the library. –  Jam Dec 3 '12 at 18:51
    
If your iPhone starts acting weird, when it gets back on the WIFI, you should check your router, and see if it's been compromised, or any DNS rules have been added. –  Kao Dec 4 '12 at 10:54
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If the phone and the mac book are independent of each other - then consider whether they are using the same source for internet connectivity - i.e. the same WiFi access point.

  1. Try changing the access point DNS to that of OpenDNS
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